topic Re: Half duplex in Operating System - HP-UX

Half duplex

Subbu Krishna — Tue, 12 Sep 2000 18:31:55 GMT

I have a N class server with quad ethernet cards. By default HP sets the PORT speed to
100M Half-duplex. I have changed this to
100M Full duplex. However, every once in
a while it changes back to 100M Half duplex.
Do you know what may be causing this problems. I would expect this to run at 100M FD when set unless the system reboots.

Thanks sk

Re: Half duplex

Kofi ARTHIABAH — Tue, 12 Sep 2000 18:42:33 GMT

Subbu:

You can make your change permanent by editting the file /etc/rc.config.d/hpbase100conf or the file corresponding to the card you are using (found in the /etc/rc.config.d directory), it explains at the top of the file how to set it up. after you have set it up accordingly, you should then run

# /sbin/init.d/hpbase100 stop; /sbin/hpbase100 start
(or the script corresponding to your interface name)

What may have been happening is that your switch may be auto-neg'ing with the card and you do not want that!

cheers.

Re: Half duplex

Subbu Krishna — Tue, 12 Sep 2000 19:21:38 GMT

I have set the port speed and mode in the rc file and the autonegotiation is off.

Re: Half duplex

Kofi ARTHIABAH — Wed, 13 Sep 2000 00:29:54 GMT

Subbu:

when it reverts to 100 HD, what do you see in the /var/adm/syslog/syslog.log file? (do you see something like lan card renegotiating connection?)

Re: Half duplex

Vincente Fernandes — Wed, 20 Sep 2000 15:22:47 GMT

You can set the it 100FD from commad line: lanadmin -X nmid 100FD
Also update "/etc/rc.config.d/hpbase100conf" file. Do an "/sbin/init.d/net start & /sbin/init.d/hp100* start".
Make sure that the switch(the connection from hub/router) is also set to 100FD or set to adjust auto.